This patch shows values on each bar by appending text nodes to bars. Values will appear if global variable showValues is true. For better control it should be made a config option.

Second change is about shouldShowTickText function. It returns always true, because when using axis:x:categories, I wish all axis values to appear.

Fixed the use of the zoom feature when you use the <base tag html. TODO: compile also the c3.min.js.